Level Designer in the 80's

If I was a level designer in the 80’s I would create a side scroller, platform game. I would create it for use on a home consoles such as the ever popular Nintendo, and its NES which owned about 90% of the local market. The game would be an action packed good guy vs. bad guy objective where a hero must save earth from an invading villain. The game would be balanced as the good guy would have to battle really tough bosses, the player must tackle each boss in a different way determining on the difficulty of the game/level.